Limestone and dolomite availability in the Ohio River valley for sulfur sorbent use, with observations on obtaining reliable chemical analyses, by David A. Stith, Thomas M. Berg, Curtis H. Ault, Garland R. Dever, Jr., John M. Masters, Samuel W. Berkheiser, Jr., Claudette Simard, and Norman C. Hester. 16 p., 12 figs., 3 tables, 1997.